Understanding the threats that climate change poses to human health can help us work together to lower risks and be prepared. Climate change threatens human health, including mental health, and access to clean air, safe drinking water, nutritious food, and shelter. Everyone is affected by climate change at some point in their lives. Some people are more affected by climate change than others because of factors like where they live; their age, health, income, and occupation; and how they go about their day-to-day life. Most women have healthy pregnancies and healthy babies. However, climate change can worsen environmental hazards that threaten the health of pregnant women and increase health risks for the baby. Air pollutants can cause respiratory illness in pregnant women and also lead to low birth weight or pre-term birth. Climate change worsens air quality because warming temperatures make it easier for ground-level ozone to form. Changing weather patterns and more intense and frequent wildfires also raise the amount of pollution, dust, and smoke in the air. Climate change will also cause extreme heat events to become more frequent and severe, which can lead to dehydration and renal (kidney) failure in pregnant women. Dehydration early in pregnancy can affect the babys growth and later in pregnancy can cause pre-term birth.